This is the Associated WolfPack 7.4V 4000mAh 2S 35C LiPo Battery.
This battery features Reedy’s molded hard case, giving your battery maximum crash protection in sizes that fit the most popular car configurations. High-quality cell manufacturing and construction techniques result in reliable operation and maximum cycle-life. Wires now exit the case through a rubber gasket which protects the wire’s insulation while helping to prevent moisture from entering the case.
Associated Reedy’s WolfPack Gen. 2 LiPo batteries come with a reliable, low-resistance T-plug connector, beefy silicone wires, and an integrated balancing harness with a XH connector.
One Associated WolfPack 7.4V 4000mAh 2S 35C Hard Case LiPo Battery with a T-Plug Connector and an Integrated Balancing Harness with an XH Connector